{1}
{2}
{3}
{1,2}
{1,3} (George Sicherman)
{1,4}
{2,3}
{2,4}
{2,5} (George Sicherman)
{3,4} (unique)
{3,5}
{3,6}
{3,7} (unique)
{3,8} (George Sicherman)
{1,2,3}
{1,2,4}
{1,2,5} (George Sicherman)
{1,3,4}
{1,3,5}
{1,3,6} (George Sicherman)
{1,3,7} (George Sicherman)
{1,3,8} (George Sicherman)
{2,3,4}
{2,3,5} (George Sicherman)
{2,3,6}
{2,3,7}
{2,3,8} (George Sicherman)
{2,4,5}
{2,4,6}
{3,4,5} (George Sicherman)
{3,4,6} (George Sicherman)
{3,4,7} (George Sicherman)
{3,4,8}
{3,5,6} (unique)